Author Topic: Sprague  (Read 389 times)

picard

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Sprague
« on: August 22, 2017, 08:45:57 AM »
Is a .01uF 630V  axial Metalized polyester film a good replacement for this picture? I get my stuff from Justradios's

electra225

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Re: Sprague
« Reply #1 on: August 22, 2017, 09:10:05 AM »
Yes.
If it ain't broke, call me.  I can break it....

picard

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Re: Sprague
« Reply #2 on: August 22, 2017, 09:29:14 AM »
Thanks

Could I use a   50 uF 25V   in place of the 60MFD 10 VDC

picard

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Re: Sprague
« Reply #3 on: August 22, 2017, 01:48:07 PM »
Or would I be better off with a

60uF 160V axial

electra225

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Re: Sprague
« Reply #4 on: August 22, 2017, 10:18:32 PM »
If that is for speaker crossover, you do not need a 160 volt cap for that.  I would go with equal or slightly greater capacity and the same or close voltage. 
If it ain't broke, call me.  I can break it....

TC Chris

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Re: Sprague
« Reply #5 on: August 22, 2017, 10:44:58 PM »
The photo shows a polarized electrolytic.  (He would need a nonpolarized cap for a speaker crossover.)  So I assume the one shown is on the chassis.  He was asking about a replacement for the 10 V. section.  It is best to match the specified capacitance, but as I recall, those older electrolytics were something like +/- 20%, weren't they?  So 50 mfd. would probably work if it was a matter of using something on hand, assuming it's a modern,, narrower-tolerance cap.

Chris Campbell

TC Chris

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Re: Sprague
« Reply #6 on: August 22, 2017, 10:46:23 PM »
Oops.  I see there was also an inquiry about the 150 V. sections.

Chris Campbell

picard

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Re: Sprague
« Reply #7 on: August 23, 2017, 08:46:23 AM »
I'm going to go with the 60MFD 160VDC  in place of the 60MFD 10VDC it say's this on the Justradios site

When replacing old paper/wax capacitors, you can't go wrong using film capacitors that have a higher voltage rating than the paper ones you are replacing. For example, if you are replacing a paper capacitor rated at 400 volts, you can use a 630-volt film capacitor (but not a 200-volt capacitor). A film capacitor with a higher voltage rating will give your tube radio better reliability and longer life


TC Chris

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Re: Sprague
« Reply #8 on: August 24, 2017, 12:05:18 AM »
The "higher voltage is OK" pertains to film caps, but the pictured multisection cap with a 50 mfd/10 V section is an electrolytic cap, and sometimes they don't do as well with large voltage discrepancies.  I'd be inclined to match the voltage closer.

Chris Campbell

picard

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Re: Sprague
« Reply #9 on: August 24, 2017, 06:53:24 AM »
They don't have a close match on Justradio's site. It's either 60MFD 160VDC  or  50 uF 25V
 What would you go with ?

heats00

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Re: Sprague
« Reply #10 on: August 24, 2017, 07:48:45 AM »
Not in any way knocking Justradio's but there are a few options on Digikey that get you much closer to the range you would be looking for.

As an example:
https://www.digikey.com/short/31w8tt

and that's just Nichicon.  You could use 56uf or 68uf versions as they would both be in the 20% swing of the original specs, and the voltages range from 16v to 63v.  There are plenty of other options available at Digikey, Mouser, and many others.  No need to limit your supply options.

picard

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Re: Sprague
« Reply #11 on: August 24, 2017, 08:59:06 AM »
Could I use a 50 uF 25V and a     10 uF 25V axial together ?

I don't understand how to order from those other companies.



electra225

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Re: Sprague
« Reply #12 on: August 24, 2017, 07:07:16 PM »
I like using Nichicon e-caps from Mouser.  But you are right.  Their website is a royal pain to navigate!  I would use the 50uf at 25V and be done with it, personally.
If it ain't broke, call me.  I can break it....

picard

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Re: Sprague
« Reply #13 on: August 24, 2017, 08:58:37 PM »
Thanks. That's what I will go with.